That seems prudent. I wondered about the 33 uF coupling caps on the output. In their app note they reference the large capacitance on the input having something to do with the overall input impedance. It also says the output coupling cap is optional if their is coupling further on down the line, which I have in my power amp input. It's 4.7 uF...plenty big enough for low end. I wasn't planning to remove the DC bias before the power amp input since my signal op amps are at +- 15 VDC supply and the preamp output swing is 1Vppk max. Even with the DC offset that still leaves plenty of headroom, at least to my inexperienced point of view.